tell on

US /tel ɑːn/
UK /tel ɑːn/
"tell on" picture
1.

acusar, chivarse

to inform an authority figure about someone's bad behavior

:
If you don't stop, I'm going to tell on you.
Si no paras, voy a acusarte.
The little boy decided not to tell on his sister.
El niño pequeño decidió no acusar a su hermana.